1 PC Used Fanuc A16B-3200-0600 PCB Board In Good condition A16B32000600 A16B-32OO-O6OO

FANUC A16B-3200-0600 | R-30iA Main PCB — Master Control Board for FANUC R-J3iC and R-30iA Robot Controllers, Dual Ethernet, Japan Origin

Overview

The FANUC A16B-3200-0600 is the master board for two of FANUC's most widely deployed industrial robot controllers: the R-J3iC and the R-30iA.

These controllers powered a generation of FANUC robots — M-10i, M-20i, M-710i, R-2000i, and many others — that became the core of automotive body welding lines, arc welding cells, handling systems, and painting facilities worldwide throughout the 2000s and 2010s.

The R-30iA in particular was FANUC's mainstream platform during this period, and the installed base of machines running this controller is enormous.

The main board in a robot controller plays a fundamentally different role from a CNC machine tool's main board. In a CNC, the main board interfaces primarily with servo amplifiers and machine I/O, executing NC programmes that describe tool paths.

In the R-30iA, the main board executes the robot's motion planning — translating high-level task commands (move joint 1 to this angle, position the TCP at these Cartesian coordinates, activate the weld gun, wait for the vision system result) into real-time joint angle trajectories and servo commands for all axes simultaneously.

The board manages this while also handling the safety monitoring functions, the teach pendant display, and the communication with the cell's PLC and any vision or force sensing peripherals.

The dual Ethernet ports built into the A16B-3200-0600 reflect the R-30iA's era — this generation of FANUC robot controllers saw the beginning of serious network connectivity requirements, with machine builders and end users wanting robots to participate in data networks for remote monitoring, programme upload/download, and production data collection.

The two Ethernet ports allow the robot to connect to an automation network while simultaneously maintaining a dedicated connection to a programming PC or vision system, without requiring additional network cards for basic connectivity.

Key Specifications

Programme and Configuration Data — What the Board Stores

The A16B-3200-0600 is unique among robot controller components because it stores the most critical data in the system.

Robot programmes, mastering data, system configuration, I/O assignments, tool coordinates (UTOOLs), user frames (UFRAMEs), collision detection settings, and all system parameters reside in the board's FROM and SRAM memory areas.

This is fundamentally different from the servo amplifier boards, safety boards, or I/O boards, which contain no system-specific data.

Mastering data is perhaps the most critical: it defines the absolute reference position for each of the robot's joints.

Without mastering data, the robot cannot determine its current pose in space and cannot execute calibrated motion.

If mastering data is lost, the robot must be re-mastered using the reference positions marked on the robot's axes — a procedure that requires the robot to be positioned precisely at its calibrated zero position, which must have been marked on the robot at installation.

Programme data includes all TP (Teach Pendant) programmes containing the robot's motion instructions, waypoints, and process commands.

These may number in the hundreds for a complex robot cell. If programme data is lost and no backup exists, each programme must be manually re-taught.

The implication is clear: before any work on the A16B-3200-0600, all robot data must be backed up to a USB memory device, memory card, or network location using the robot's image backup function. The complete image backup captures all data in a single operation.

This backup should be performed not just before planned maintenance, but as a routine scheduled activity — ideally daily or weekly depending on the frequency of programme changes.

The R-30iA Controller Architecture — How the Main Board Fits

Inside the R-30iA's compact vertical cabinet, the A16B-3200-0600 sits in its backplane alongside whatever daughter cards the robot's configuration requires.

A 6-axis robot needs an axis control card capable of managing 6 axes (plus the external axis if present); a larger robot with external axes needs a higher-count axis card. 

The FROM/SRAM module on the main board holds the robot software, system parameters, and programme data. 

The CPU card (if separately installed) provides the computational resources.

The servo amplifiers (the A06B-6107 series in the R-30iA) sit in the same cabinet and communicate with the main board via the FSSB (FANUC Serial Servo Bus) — the same fibre-optic serial bus used in the CNC world.

From the main board's perspective, each robot joint is managed through the FSSB link to the servo amplifier controlling that joint's servo motor.

The main board sends position commands, receives position feedback, and closes the motion loop at 125µs intervals for all axes simultaneously.

Backplane Selection and Module Configuration

The A16B-3200-0600 specifies that it needs either the 2-slot or 4-slot backplane for installation in the R-30iA chassis.

The backplane provides the physical connector interface between the main board and the controller's power supply and internal bus. 

When sourcing a replacement board, confirming which backplane is installed in the specific robot controller is essential — the backplane configuration determines which slot arrangement is present and whether the board will physically connect.

The various daughter card options that "may be installed horizontally to the main board" — the exact options available depend on the robot's original order specification.

These cards include CPU options (which upgrades the processing speed for applications requiring faster path planning), axis control cards (which determines how many axes the system manages), and memory modules (which determines how much programme and configuration memory is available).

When replacing the main board, the original daughter cards from the failed board should be transferred to the replacement board, ensuring the configuration match is preserved.

FAQ

Q1: The robot shows "SRVO-003 Servo init error" and cannot operate. Is this the main board?

SRVO-003 is a servo initialisation failure — the robot's servo system could not initialise properly during startup.

This can originate from: the servo amplifier failing to establish FSSB communication with the main board; a failed servo amplifier for a specific axis; incorrect servo parameters; or in some cases, a main board fault affecting the FSSB transmitter circuit.

Check the servo amplifier indicators first — each axis amplifier should show a specific LED pattern during initialisation. 

If a specific amplifier shows a fault LED while others initialise normally, the fault is in that amplifier or its connected motor. If all amplifiers fail to initialise simultaneously and the FSSB cable and connections are confirmed good, the main board's FSSB circuit becomes suspect.

Q2: After replacing the A16B-3200-0600 and loading the backup, the robot's mastering positions seem wrong. What causes this?

If the mastering data restore was included in the image backup and was correctly restored, mastering positions should be accurate.

The most common causes of apparent mastering error after board replacement are: the backup was made when the robot was not at its true calibrated position (mastering had drifted or was corrected after the backup was made); the backup was restored incorrectly or incompletely; or the mastering data was not included in the backup scope. 

Verify by moving each joint to its marked reference position and checking the current value against the expected count at that position. Discrepancies indicate mastering re-calibration is needed.

Q3: Does replacing the A16B-3200-0600 affect the robot's safety category certification (if applicable)?

If the robot installation includes functional safety options (FANUC DCS — Dual Check Safety) based on software running on this board, the safety function configuration (zone boundaries, speed limits, stop conditions) is included in the robot's backup data. Restoring the backup should restore this configuration.

However, any safety-rated installation that has gone through formal risk assessment and validation requires re-validation after replacing safety-related hardware.

Consult the safety documentation for the specific installation and involve the responsible safety engineer before certifying the system back into service.

Q4: The robot has a FANUC KAREL programme running a complex process. Is this stored on the main board?

Yes. KAREL programmes (compiled application-level programmes written in FANUC's KAREL language) are stored in the FROM area of the controller — the same memory managed by the A16B-3200-0600.

These programmes are included in the full image backup. 

If the backup was made when the KAREL programmes were current, they will be restored from the backup along with the TP programmes and system data.

If the programmes were updated after the last backup, the changes are lost and must be re-deployed from the development environment.

Q5: Can a main board from an R-30iA controller be used in an R-J3iC controller, or are they the same?

The A16B-3200-0600 is listed as compatible with both R-J3iC and R-30iA controllers — these two controller generations share the main board hardware.

The R-30iA was essentially the successor to the R-J3iC, using the same or closely related hardware with updated software. 

Board compatibility at the hardware level between these two controller versions allows the A16B-3200-0600 to serve both. 

The software version and registration on the board must be appropriate for the specific controller and robot model it is installed in — FANUC software versions for the R-30iA and R-J3iC may differ, and installing an R-30iA software version in an R-J3iC without proper configuration can result in functionality issues.